Anatomy and Physiology II Practice Test

The milk-secreting glandular cells of the breast are organized into structures called what?

1. Alveoli

2. Lobules

3. Sinuses

4. Acini

The correct answer is: Alveoli

The milk-secreting glandular cells of the breast are indeed organized into structures called alveoli. In the context of mammary tissue, alveoli are small sac-like structures where milk is produced and stored before being released during lactation. These alveoli are lined with specialized epithelial cells that respond to hormonal signals, primarily prolactin, during the breastfeeding process to produce milk. This organization supports efficient milk production and delivery, as each alveolus is connected to a duct system that transports milk to the nipple. Understanding the structure and function of alveoli is critical in comprehending how the breast facilitates lactation and supports newborn nutrition.